It appears that spectacle currently only gives you the options to record “Workspace”, “Selected Screen”, and “Selected Window”. It would be nice to also have the option to record a selected area in the same way as you can select an area for screenshots.
I couldn’t find any issue for this on GitLab. I figured I’d ask here first, as I don’t really want to go through making a KDE Identity to open an issue on GitLab if I don’t need to.
Not a plan, but a wish has been made: https://bugs.kde.org/show_bug.cgi?id=469779